SDC: Secure Data Collection for Time Based Queries in Tiered Wireless Sensor Networks

Tiered wireless sensor networks (WSNs) have many advantages over traditional WSNs. However they are vulnerable to security attacks, especially those targeting at the storage nodes that bu er and process the data readings from sensors. In this paper, we propose a Secure Data Collection protocol - SDC to support time-based queries in tiered WSNs. With small overhead introduced to data communication, SDC protects both data confidentiality and data integrity. In particular it employs data co-commitment such that it can detect and evaluate the message dropping attacks in the network.